<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>novalidate 属性</title>
</head>
<body>

<form action="/example/html5/demo_form.asp" method="get" novalidate="novalidate">
  E-mail: <input type="email" name="user_email" />
  <input type="submit" />
</form>

</body>
</html>